Is this a TODO item? ---------------------------------------------------------------------------
Adriano Lange wrote: > Hi > > Tobias Zahn escreveu: > > Hello Adriano, > > thank you very much for posting your patch. I think it will help to make > > further work easier, too. I hope you don't mind when I ask you some > > questions. > > > > When you said that this new approach is worse or equal than GEQO, did > > you refer to performance or to the quality of results? > > Not exactly this approach, but the implemented (and not configured) > algorithm was worse than GEQO in a little test made. I just used a > sequence of 8 executions of a query with 18 relations for each > algorithm. The costs generated by GEQO was little better than 2PO, in > average and standard deviation. But 8 executions and 1 query don't prove > anything. I want to make some further tests, but this little difference > seems good for me. > > > Why do you think that compressed annealing might be the better approach? > > I don't think if compressed annealing is better or not. I don't read > about it yet. > > However, an optimizer can be better in a context but worse in another. > > Regards, > Adriano > > -- > Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-hackers -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + If your life is a hard drive, Christ can be your backup. + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
